A concrete stair (Figure 14.40) may be thought of as an inclined one-way solid slab with additional concrete added to make risers and treads. The underside of the formwork is planar. The top is built with riser forms, which are usually inclined to provide greater toe space and make the stair more comfortable to users. The concrete is poured in one operation, and the treads are tooled to a steel trowel finish.
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